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C++ Modern Features

bookUniform Initialization

Uniform initialization, introduced in C++11, provides a consistent brace {} syntax for initializing variables, arrays, structs, and objects.

main.cpp

main.cpp

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int a {5};        // Initialize 'int'
double b {3.14};  // Initialize 'double'
char c {'A'};     // Initialize 'char'
Note
Note

Using braces {} avoids accidental narrowing conversions. For example, int a{3.5}; would cause a compile-time error.

Uniform initialization works consistently for both built-in and standard containers.

main.cpp

main.cpp

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#include <array>
#include <iostream>

int main()
{
    int numbers[] {1, 2, 3, 4};             // Built-in array
    std::array<int, 3> arr {10, 20, 30};    // `std::array`

    std::cout << numbers[3] << ", " << arr[2] << std::endl;
}

You can initialize structs and classes directly using braces.

main.cpp

main.cpp

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#include <iostream>

struct Point {
    int x;
    int y;
};

int main()
{
    Point p1 {7, 9};   // Uniform initialization for `struct`
    std::cout << "(" << p1.x << ", " << p1.y << ")" << std::endl;
}

Uniform initialization gives a single, safe way to initialize any object using braces { }, reducing ambiguity and preventing narrowing errors.

question mark

What is one benefit of using uniform initialization {}?

Select the correct answer

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Sezione 1. Capitolo 2

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Uniform initialization, introduced in C++11, provides a consistent brace {} syntax for initializing variables, arrays, structs, and objects.

main.cpp

main.cpp

copy

              
123

            
int a {5};        // Initialize 'int'
double b {3.14};  // Initialize 'double'
char c {'A'};     // Initialize 'char'
Note
Note

Using braces {} avoids accidental narrowing conversions. For example, int a{3.5}; would cause a compile-time error.

Uniform initialization works consistently for both built-in and standard containers.

main.cpp

main.cpp

copy

              
12345678910

            
#include <array>
#include <iostream>

int main()
{
    int numbers[] {1, 2, 3, 4};             // Built-in array
    std::array<int, 3> arr {10, 20, 30};    // `std::array`

    std::cout << numbers[3] << ", " << arr[2] << std::endl;
}

You can initialize structs and classes directly using braces.

main.cpp

main.cpp

copy

              
123456789101112

            
#include <iostream>

struct Point {
    int x;
    int y;
};

int main()
{
    Point p1 {7, 9};   // Uniform initialization for `struct`
    std::cout << "(" << p1.x << ", " << p1.y << ")" << std::endl;
}

Uniform initialization gives a single, safe way to initialize any object using braces { }, reducing ambiguity and preventing narrowing errors.

question mark

What is one benefit of using uniform initialization {}?

Select the correct answer

Tutto è chiaro?

Come possiamo migliorarlo?

Grazie per i tuoi commenti!

Sezione 1. Capitolo 2
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